<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/schema/zthes-1.0.dtd">  <Zthes><term><termId>4800</termId><termName>Luz - Difusión</termName><termType>PT</termType><termLanguage>es</termLanguage><termVocabulary>INDICES DE MATERIAS</termVocabulary>	<termStatus>active</termStatus>	<termApproval>approved</termApproval>	<termSortkey>Luz - Difusión</termSortkey><termNote label="Source"><![CDATA[ 535.36 ]]></termNote><termCreatedDate>Luz - Difusión</termCreatedDate><relation><relationType>UF</relationType><termId>4801</termId><termName>Difusión de la luz</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>4802</termId><termName>Luz - Difusión molecular</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>4770</termId><termName>Área 2. Óptica física</termName><termType>PT</termType></relation></term>  </Zthes>